Corner-clamping appliance.



O. BERGSTROM.

CORNER OLAMPING APPLIANCE.

APPLICATION FILED MAR.18, 1912.

1,053,556,, Patented Feb. 18, 1913.

1 heads and hold the 1 cation.

UNITED STATES PATENT OFFICE.

OSCAR BERGSTROM, OF CHICAGO, ILLINOIS, ASSIGNOR ,TO HANDY MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CORNER-CLAMPIN G APPLIANCE.

To all whom. may concern: 7

Be it known. that-I, OSCAR BERGSTROM, a citizen of the United States, residing at Chicagoyin the-county of Cook and State of Illinois, have invented a new and useful Improvement in Corner-Clamping Appliances, of which the following is a specifi- My invention relates to improvements in the class of a pliances used for clamping I together the sides or members of a frame, n'ewel post, column and analogous wood- I so work at the opposing surfaces of their angl'es or corners'while the glue uniting them is setting, or to facilitate securing them together by other means.

My improvements relate particularly to the kind of appliance in the class referred to consisting of a head for each angle of the work, containing a socket to fit against and embrace the same, a chain or other suitable flexible medium passed about the structure at the heads, and means for releasably fastening the chain, or the like, at its ends to tighten it about the structure at the parts in their proper relation.

My'object is to improve, in details, the construction of the corner-heads and chainfastenin means, thereby to simplify them and ren er them more effective in their purpose and convenient..- of adjustm eiit to and' separation from thtwerk. 5

In the accompanyingdrawing,igure 1 is a plan view showing mycompleteappliance in use on a rectangular frame, the sides of which have mitered meeting-edges; Fig. 2 is a view in side elevation of one of several similar corner-clamping heads; Figs. 3 and 4 are sections respectively on line 3 and line 4, Fig. 1, and Fig. 5is an enlarged perspective view of the adjustable member of the chain-tightener.

As shown in Fig. 1, the appliance comprises three similar heads 6, and afourth head 7, each being an integral metal body, preferably a malleable casting, formed with a face-socket 8 of V-shape with longitudinal strengthening ribs 9 on its back. On each of .the similar heads 6 the strengtheningribs meet at its apex 10 in a bifurcated bearing 11, forming an extension of the ribs and projecting outwardly from the apex and closed at its outer end, and having journaled in it, near its inner end, ananti- Specification of Letters latent. 1 Application flied larch 18, 1912. Serial No. 684,582.

Patented Feb. 18 191 3.

friction roller 12'for a chain 13. Thehead 7 has formed on each wing of its back a bifurcated bearing 14, in which is journaled an anti-fn'ction roller 15 for'the end-por-.

tions of the chain. From this headextends the chain-tightening device 16, constructed as follows: A hgllow post 17 formed preferably of two parallel bars spaced apart and extending in line with the apex between the bearings 14, has a closed outer end forming a bearing for a set-screw 19 having a handle 20 on its outer end, shown in the preferred formof a hand-wheel. In oppo-.

site sides of the post are longitudinal slots 21. A block 22 of rectangular cross-section extends transversely through the post to project at its ends beyond the open sides thereof, one end of the block being provided with a hook 23 permanently connecting with it one end of the chain 13 and the other block-end containing a'central socket 24 with slots 25 in two of its opposite sides, the socket being adapted to receive flatwise a link of the chain, and the links flanking that link entering edgewise the slots 25,

whereby the free end-portion of the chain may be readily slipped into the socket, as to any link caused to register therewith, and held against longitudinal withdrawal in either direction by the confinement of the intermediate link. A pin 26 extends transversely through the block between its ends the heads are adjusted against the frame corners to embrace them, and the screw 19 is turned to tighten the chain about the structure in drawing it simultaneously at both ends by pulling the block 22 outwardly lengthwise of the post 17. Obviously, by turning the screw in the opposite direction,

the chain is slackened to free the appliance,-

which may then be readily taken oil" the frame. I

What I claim as new and desire to 'secure by Letters Patent is:

1. In a clamping appliance of the char- Fa; r f- 0 actor described, in combination, a plurality of V-shaped metal heads, a chain connecting said heads and longitudinally movable thereon, and tightening means for the chain comprising a hollow post open along two opposite sides with a bearing on its outer end and slots in its two other sides, a block extending transversely through the post,"

having one end of the chain secured to one of its ends, a socket in its opposite end providedwith side-slots, for releasably connecting therewith the free-end portion of the chain and a pin extending transversely through it between its ends into said slots, and a handle-equipped set-screw working through said bearing and pin.

2. A clamping anpliance of the character described, comprislng, in combination, a plurality of V-shaped metal heads forming angular face sockets and provided with roller-equipped bearings, chain-tightening means on one head comprising a hollow post extending from its back in alinement with the apex, said post being open along two opposite sides with the roller-bearings adjacentto its base and having slots in its two other sides and a bearing on its outer j end; a block extending transversely through" the post and having a socket in one end provided with side-slots and a pin extending transversely through it between its ends into said slots, a chain secured at one end to an end of said block and releasably engageable at its free-end portion with said socket, and a handle-equipped set-screw working through said post-bearing and pin.

OSCAR BERGSTROM. In presence of- L. HEISLAR,

R. SCHAEFER. 

